435 W single-frequency all-fiber amplifier at 1064 nm based on cascaded hybrid active fibers

Shi, Chaodu; Fu, Shijie; Deng, Xun; Sheng, Quan; Yang, Xu; Fang, Qiang; Sun, Shuai; Zhang, Junxiang; Shi, Wei; Yao, Jianquan

doi:10.1016/j.optcom.2021.127428

Cited by 14 publications

(4 citation statements)

References 20 publications

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“…According to Ref. [26], the slope efficiency can be improved by hybrid pumping, which corresponds with the outcome of this study. Meanwhile, Figure 3b and its inset show the growth trend of the backward propagating power and backward spectra within 1029-1031 nm using an optical spectrum analyzer (OSA) with a resolution of 0.02 nm, indicating that the SBS effect did not occur.…”

Section: Hybrid Pumping With a Power Ratio Of 1:44supporting

confidence: 88%

650 W All-Fiber Single-Frequency Polarization-Maintaining Fiber Amplifier Based on Hybrid Wavelength Pumping and Tapered Yb-Doped Fibers

et al. 2022

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Based on hybrid wavelength pumping and tapered Yb-doped fibers (T-YDFs), a 650 W all-fiber single-frequency polarization-maintaining fiber amplifier was demonstrated experimentally at 1030 nm. Different pump power ratios in the T-YDF-based power-amplifier stage were proposed to investigate their influence on the transverse mode instability (TMI) effect. The highest TMI threshold was obtained when the pump power ratio of 940 nm to 976 nm was 1:4.4. A measured M2 factor of 1.7 and a polarization extinction ratio of 14 dB at the maximum output power were obtained. To the best of our knowledge, these results exhibit the highest output power of any all-fiber single-frequency polarization-maintaining fiber amplifiers created up to now.

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Section: Hybrid Pumping With a Power Ratio Of 1:44supporting

confidence: 88%

650 W All-Fiber Single-Frequency Polarization-Maintaining Fiber Amplifier Based on Hybrid Wavelength Pumping and Tapered Yb-Doped Fibers

et al. 2022

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“…Another recent work about mitigating the TMI effect in a high-power SFFA used leveraging of cascaded LMA-YDFs with different dopant concentrations and lengths for optimizing the heat loads, and hybrid pumping wavelengths (915 nm and 976 nm) with a delicately allocated power ratio for increasing the TMI threshold via a reinforced saturation level, with which a non-polarized single-frequency power of 435 W was obtained from a forward-pumped monolithic fiber amplifier with a core diameter of 30 μm [90] . By further optimizing the amplification system, the same group significantly pushed the output power to an impressive level of 703 W, with a spectral linewidth of Fig.…”

Section: All-fiber Couplingmentioning

confidence: 99%

High-power single-frequency fiber amplifiers: progress and challenge [Invited]

Li,

Tao,

Jiang

et al. 2023

中国光学快报

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Unlike conventional continuous-wave lasers with wide spectra, the amplification of single-frequency lasers in optical fibers is much more difficult owing to the ultra-high power spectral density induced nonlinear stimulated Brillouin scattering effect. Nevertheless, over the past two decades much effort has been devoted to improving the power scaling and performance of high-power single-frequency fiber amplifiers. These amplifiers are mostly driven by applications, such as high precision detection and metrology, and have benefited from the long coherence length, low noise, and excellent beam quality of this type of laser source. In this paper, we review the overall development of high-power single-frequency fiber amplifiers by focusing on its progress and challenges, specifically, the strategies for circumventing the stimulated Brillouin scattering and transverse mode instability effects that, at present, are the major limiting factors of the power scaling of the single-frequency fiber amplifiers. These factors are also thoroughly discussed in terms of free-space and all-fiber coupled architecture. In addition, we also examine the noise properties of single-frequency fiber amplifiers, along with corresponding noise reducing schemes. Finally, we briefly envision the future development of high-power single-frequency fiber amplifiers.

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“…For monolithic 1 µm single-frequency amplifiers, the maximum achieved output power is 550 W based on a tapered Yb-doped fiber [8], whereas the non-linearly polarized state is insufficient for many practical applications. Other reports in high-power linearly-polarized 1 µm SFFLs ranges between 300-435 W with the implementation of LMA fiber that has a core diameter of 30 µm [7,13,14]. However, it is well known that such large core diameter fibers are prone to develop dynamic transversal mode instabilities at high pump power level even though the measured M 2 parameter is smaller than 1.1 [15].…”

Section: Introductionmentioning

confidence: 99%

252 W core-pumped single-frequency all-fiber amplifier at 1064 nm

Tao

Jiang

Liu

et al. 2023

AOPC 2022: Advanced Laser Technology and Applications

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A high-power linearly-polarized all-fiber single-frequency amplifier at 1064 nm based on tandem corepumping is demonstrated by adopting large-mode-area (LMA) fiber with core/cladding diameter of 20/130 µm. The output performance of the amplifier dependence on the input signal power has been investigated, and the results indicate that enhancing the injection signal power is advantageous in mitigating the amplified simultaneous emission (ASE) and increasing slope efficiency. A maximum output power of 252 W with corresponding slope efficiency of 85% is achieved with injection signal power of 7 W. At the highest output power status, a polarization extinction ratio (PER) of 17 dB and a beam quality of 1.15 are obtained respectively. In addition, by virtue of LMA fiber and tandem core-pumping, the amplifier exhibits good performance on thermal load, which in turn facilitate the maintenance of frequency noise and linewidth. To the best of our knowledge, this is the highest output power of single-frequency all-fiber amplifier based on core-pumping scheme.

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435 W single-frequency all-fiber amplifier at 1064 nm based on cascaded hybrid active fibers

Cited by 14 publications

References 20 publications

650 W All-Fiber Single-Frequency Polarization-Maintaining Fiber Amplifier Based on Hybrid Wavelength Pumping and Tapered Yb-Doped Fibers

650 W All-Fiber Single-Frequency Polarization-Maintaining Fiber Amplifier Based on Hybrid Wavelength Pumping and Tapered Yb-Doped Fibers

High-power single-frequency fiber amplifiers: progress and challenge [Invited]

252 W core-pumped single-frequency all-fiber amplifier at 1064 nm

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